hwmon: (peci) Rely on subsystem locking

Attribute access is now serialized in the hardware monitoring core,
so locking in the driver code is no longer necessary. Drop it.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
pull/1354/merge
Guenter Roeck 2025-09-08 16:22:27 -07:00
parent fd0443a924
commit 1ba1fd1f60
3 changed files with 23 additions and 69 deletions

View File

@ -1,7 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2021 Intel Corporation */
#include <linux/mutex.h>
#include <linux/types.h>
#ifndef __PECI_HWMON_COMMON_H
@ -13,12 +12,10 @@
* struct peci_sensor_state - PECI state information
* @valid: flag to indicate the sensor value is valid
* @last_updated: time of the last update in jiffies
* @lock: mutex to protect sensor access
*/
struct peci_sensor_state {
bool valid;
unsigned long last_updated;
struct mutex lock; /* protect sensor access */
};
/**

View File

@ -116,11 +116,9 @@ static int get_temp_target(struct peci_cputemp *priv, enum peci_temp_target_type
{
int ret;
mutex_lock(&priv->temp.target.state.lock);
ret = update_temp_target(priv);
if (ret)
goto unlock;
return ret;
switch (type) {
case tcontrol_type:
@ -139,9 +137,6 @@ static int get_temp_target(struct peci_cputemp *priv, enum peci_temp_target_type
ret = -EOPNOTSUPP;
break;
}
unlock:
mutex_unlock(&priv->temp.target.state.lock);
return ret;
}
@ -177,26 +172,23 @@ static s32 dts_eight_dot_eight_to_millidegree(u16 val)
static int get_die_temp(struct peci_cputemp *priv, long *val)
{
int ret = 0;
long tjmax;
u16 temp;
int ret;
mutex_lock(&priv->temp.die.state.lock);
if (!peci_sensor_need_update(&priv->temp.die.state))
goto skip_update;
ret = peci_temp_read(priv->peci_dev, &temp);
if (ret)
goto err_unlock;
return ret;
if (!dts_valid(temp)) {
ret = -EIO;
goto err_unlock;
}
if (!dts_valid(temp))
return -EIO;
ret = get_temp_target(priv, tjmax_type, &tjmax);
if (ret)
goto err_unlock;
return ret;
priv->temp.die.value = (s32)tjmax + dts_ten_dot_six_to_millidegree(temp);
@ -204,35 +196,30 @@ static int get_die_temp(struct peci_cputemp *priv, long *val)
skip_update:
*val = priv->temp.die.value;
err_unlock:
mutex_unlock(&priv->temp.die.state.lock);
return ret;
return 0;
}
static int get_dts(struct peci_cputemp *priv, long *val)
{
int ret = 0;
u16 thermal_margin;
long tcontrol;
u32 pcs;
int ret;
mutex_lock(&priv->temp.dts.state.lock);
if (!peci_sensor_need_update(&priv->temp.dts.state))
goto skip_update;
ret = peci_pcs_read(priv->peci_dev, PECI_PCS_THERMAL_MARGIN, 0, &pcs);
if (ret)
goto err_unlock;
return ret;
thermal_margin = FIELD_GET(DTS_MARGIN_MASK, pcs);
if (!dts_valid(thermal_margin)) {
ret = -EIO;
goto err_unlock;
}
if (!dts_valid(thermal_margin))
return -EIO;
ret = get_temp_target(priv, tcontrol_type, &tcontrol);
if (ret)
goto err_unlock;
return ret;
/* Note that the tcontrol should be available before calling it */
priv->temp.dts.value =
@ -242,35 +229,30 @@ static int get_dts(struct peci_cputemp *priv, long *val)
skip_update:
*val = priv->temp.dts.value;
err_unlock:
mutex_unlock(&priv->temp.dts.state.lock);
return ret;
return 0;
}
static int get_core_temp(struct peci_cputemp *priv, int core_index, long *val)
{
int ret = 0;
u16 core_dts_margin;
long tjmax;
u32 pcs;
int ret;
mutex_lock(&priv->temp.core[core_index].state.lock);
if (!peci_sensor_need_update(&priv->temp.core[core_index].state))
goto skip_update;
ret = peci_pcs_read(priv->peci_dev, PECI_PCS_MODULE_TEMP, core_index, &pcs);
if (ret)
goto err_unlock;
return ret;
core_dts_margin = FIELD_GET(PCS_MODULE_TEMP_MASK, pcs);
if (!dts_valid(core_dts_margin)) {
ret = -EIO;
goto err_unlock;
}
if (!dts_valid(core_dts_margin))
return -EIO;
ret = get_temp_target(priv, tjmax_type, &tjmax);
if (ret)
goto err_unlock;
return ret;
/* Note that the tjmax should be available before calling it */
priv->temp.core[core_index].value =
@ -280,9 +262,7 @@ static int get_core_temp(struct peci_cputemp *priv, int core_index, long *val)
skip_update:
*val = priv->temp.core[core_index].value;
err_unlock:
mutex_unlock(&priv->temp.core[core_index].state.lock);
return ret;
return 0;
}
static int cputemp_read_string(struct device *dev, enum hwmon_sensor_types type,
@ -431,18 +411,6 @@ static void check_resolved_cores(struct peci_cputemp *priv)
bitmap_zero(priv->core_mask, CORE_NUMS_MAX);
}
static void sensor_init(struct peci_cputemp *priv)
{
int i;
mutex_init(&priv->temp.target.state.lock);
mutex_init(&priv->temp.die.state.lock);
mutex_init(&priv->temp.dts.state.lock);
for_each_set_bit(i, priv->core_mask, CORE_NUMS_MAX)
mutex_init(&priv->temp.core[i].state.lock);
}
static const struct hwmon_ops peci_cputemp_ops = {
.is_visible = cputemp_is_visible,
.read_string = cputemp_read_string,
@ -507,8 +475,6 @@ static int peci_cputemp_probe(struct auxiliary_device *adev,
check_resolved_cores(priv);
sensor_init(priv);
hwmon_dev = devm_hwmon_device_register_with_info(priv->dev, priv->name,
priv, &peci_cputemp_chip_info, NULL);

View File

@ -96,16 +96,15 @@ static int get_dimm_temp(struct peci_dimmtemp *priv, int dimm_no, long *val)
{
int dimm_order = dimm_no % priv->gen_info->dimm_idx_max;
int chan_rank = dimm_no / priv->gen_info->dimm_idx_max;
int ret = 0;
u32 data;
int ret;
mutex_lock(&priv->dimm[dimm_no].temp.state.lock);
if (!peci_sensor_need_update(&priv->dimm[dimm_no].temp.state))
goto skip_update;
ret = peci_pcs_read(priv->peci_dev, PECI_PCS_DDR_DIMM_TEMP, chan_rank, &data);
if (ret)
goto unlock;
return ret;
priv->dimm[dimm_no].temp.value = __dimm_temp(data, dimm_order) * MILLIDEGREE_PER_DEGREE;
@ -113,9 +112,7 @@ static int get_dimm_temp(struct peci_dimmtemp *priv, int dimm_no, long *val)
skip_update:
*val = priv->dimm[dimm_no].temp.value;
unlock:
mutex_unlock(&priv->dimm[dimm_no].temp.state.lock);
return ret;
return 0;
}
static int update_thresholds(struct peci_dimmtemp *priv, int dimm_no)
@ -145,10 +142,9 @@ static int get_dimm_thresholds(struct peci_dimmtemp *priv, enum peci_dimm_thresh
{
int ret;
mutex_lock(&priv->dimm[dimm_no].thresholds.state.lock);
ret = update_thresholds(priv, dimm_no);
if (ret)
goto unlock;
return ret;
switch (type) {
case temp_max_type:
@ -161,9 +157,6 @@ static int get_dimm_thresholds(struct peci_dimmtemp *priv, enum peci_dimm_thresh
ret = -EOPNOTSUPP;
break;
}
unlock:
mutex_unlock(&priv->dimm[dimm_no].thresholds.state.lock);
return ret;
}
@ -349,8 +342,6 @@ static int create_dimm_temp_info(struct peci_dimmtemp *priv)
ret = create_dimm_temp_label(priv, i);
if (ret)
return ret;
mutex_init(&priv->dimm[i].thresholds.state.lock);
mutex_init(&priv->dimm[i].temp.state.lock);
}
dev = devm_hwmon_device_register_with_info(priv->dev, priv->name, priv,